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#1
10-20-2009, 01:53 PM
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Need to know Engine RPM for 722.5 Trans. at Hig way speed please?
Hi Guys, I want to swap in a 722.5 5 speed trans for my 91 300se. I need an extra overdrive gear to boot up the gas mileages and lower the RPM. Please can any one of you tell me what is the RPM you guys at about 75mph for a 722.5 trans with overdrive on. Right now I have a 722.351 4 speed in it at 75mph it read about 3650RPM or more, incredible high!
Hope you guys share some data for me to compare the beneficial between two trans. Thanks (BTW, FYI, my trans NOT SLIP, run good just paid $1500 for rebuilt.) 
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#3
10-20-2009, 04:55 PM
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In part, the final drive ratio of the rear axle really effects your revving at higher speeds.
__________________
Allen Kroliczek Oak Grove Autosport | Oak Grove Autosport 01 G500, 82 300TD, quite a few more.....
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#4
10-20-2009, 05:24 PM
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The E-class / 124 has a 4-speed automatic through EOP / MY '95.
You might consider the taller final-drive of a V-8 or diesel W126.
__________________
 Gone to the dark side - Jeff
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#5
10-20-2009, 05:39 PM
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Quote:
The wagon's have a suitable final drive I think for reasonable acceleration and somewhat decent highway revving. I thought the 5 speed auto was introduced in the W124 on all models in the 94-95 MY's?
__________________
Allen Kroliczek Oak Grove Autosport | Oak Grove Autosport 01 G500, 82 300TD, quite a few more.....
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#6
10-20-2009, 07:48 PM
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No, still the 4speed.
__________________
Gone to the dark side - Jeff
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#7
10-20-2009, 10:38 PM
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I think of this each time I drive my SDL into town, ya know that looking for 5th gear. It's also well above 3k at a stiff hiway cruise.
I would love to find out what the verdict is. I dont want a higher rear end gear r/t lack of torque.
__________________
87 300SDL (Silver/red) 08 VW GTI (Sold) 89 F250 5sp turbo diesel 00 Triumph Sprint ST (4sale) 00 Polaris Xplorer 400 4x4 09 Kawi KLR
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#8
10-20-2009, 10:43 PM
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I drive a 1990 300SEL with the same transmission. Your RPM at 75MPH is correct for that transmission and that rear end. It is the same as mine. The SE and the SEL with the 103 engine are geared for higher RPM. I know it seems like you should upshift to a higher gear, I felt the same way when I got my first 300SEL, but it's just the way it is.
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